{"title":"Altermagnetic Materials","description":"\u003cp\u003eAltermagnets combine zero net magnetization with spin-split electronic bands. This collection gathers single crystals of established altermagnetic materials, including the room-temperature d-wave altermagnet KV₂Se₂O, the hidden altermagnet CsV₂Te₂O, and the high-temperature altermagnet CrSb.\u003c\/p\u003e","products":[{"product_id":"crsb-chromium-antimonide","title":"CrSb (Chromium Antimonide)","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eA binary transition-metal pnictide crystallizing in the hexagonal NiAs-type structure, space group P6₃\/mmc. It is a prominent candidate \u003c\/span\u003e\u003cstrong\u003ealtermagnet\u003c\/strong\u003e\u003cspan\u003e, a newly recognized magnetic class combining zero net magnetization (like an antiferromagnet) with spin-split electronic bands (like a ferromagnet); CrSb hosts a high magnetic ordering temperature (T_N well above room temperature, ~700 K) and a large momentum-dependent spin splitting confirmed by photoemission. This robust, room-temperature altermagnetic order makes CrSb a leading platform for studying \u003c\/span\u003e\u003cstrong\u003ealtermagnetism, spin-split transport, and antiferromagnetic spintronics\u003c\/strong\u003e\u003cspan\u003e without stray magnetic fields.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"UTF-8\"\u003e\n\u003cstrong\u003eSample specifications:\u003c\/strong\u003e Individual crystals measure approximately \u003cstrong\u003e2–3 mm\u003c\/strong\u003e, with a purity of up to \u003cstrong\u003e99.9999% (6N)\u003c\/strong\u003e, and multiple high-quality single-crystal pieces included in each package.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExfoliation: Difficult — strong interlayer bonding; mechanical exfoliation typically yields thick flakes, and ultrathin flakes are challenging to isolate.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGrowth method: Flux growth.\u003c\/span\u003e\u003c\/p\u003e","brand":"2D Material Supermarket","offers":[{"title":"Default Title","offer_id":53930461987000,"sku":"2MS-CrSb","price":950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0649\/0069\/4200\/files\/91f5a4b89f1b1ba558eefc49f65fe22e_fe64723b-f29a-4c12-9b7b-5bf5572bb734.jpg?v=1786960081"},{"product_id":"kv-se-o-potassium-vanadium-oxyselenide","title":"KV₂Se₂O (Potassium Vanadium Oxyselenide)","description":"\u003cp\u003eKV\u003csub\u003e2\u003c\/sub\u003eSe\u003csub\u003e2\u003c\/sub\u003eO is a layered vanadium oxyselenide with a tetragonal structure (space group P4\/mmm), built from anti-CuO\u003csub\u003e2\u003c\/sub\u003e-type V\u003csub\u003e2\u003c\/sub\u003eO square-lattice layers interleaved with Se and K layers. It is the first experimentally established \u003cstrong\u003emetallic room-temperature d-wave altermagnet\u003c\/strong\u003e: its collinear compensated magnetic order persists above room temperature (with an additional spin-density-wave-like transition near 100 K), while mirror\/rotation symmetries connecting the opposite-spin V sublattices produce a large, momentum-dependent spin splitting of the electronic bands with zero net magnetization. Angle-resolved photoemission (including spin-resolved measurements), NMR, and scanning tunneling microscopy studies have confirmed its highly anisotropic, spin-polarized Fermi surface and d-wave spin-momentum locking (\u003cem\u003eNature Physics\u003c\/em\u003e 21, 754–759 (2025); \u003cem\u003eNature\u003c\/em\u003e (2026), two-dimensional d-wave altermagnetic order at its surface). With spin-split metallic bands, no stray fields, and ordering at room temperature, KV\u003csub\u003e2\u003c\/sub\u003eSe\u003csub\u003e2\u003c\/sub\u003eO single crystals are a leading platform for \u003cstrong\u003ealtermagnetism research, spin-split transport, and antiferromagnetic spintronics\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrowth method:\u003c\/strong\u003e Self-flux growth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e Single crystal, typical size ~1–1.5 mm; purity up to 99.9999% (6N). Multiple high-quality single-crystal pieces are included in each package.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExfoliation difficulty:\u003c\/strong\u003e Moderate — a layered van der Waals crystal that can be mechanically cleaved\/exfoliated, although the ionic interlayer bonding makes isolating ultrathin flakes more demanding than in typical van der Waals materials.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e A small amount of potassium (~5%) may remain in the crystals: potassium is removed by deintercalation during synthesis, and its complete removal cannot always be guaranteed.\u003c\/p\u003e","brand":"2D Material Supermarket","offers":[{"title":"Default Title","offer_id":54712253481144,"sku":"2MS-KV2Se2O","price":950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0649\/0069\/4200\/files\/logo-main-1600.png?v=1794313848"},{"product_id":"csv-te-o-cesium-vanadium-oxytelluride","title":"CsV₂Te₂O (Cesium Vanadium Oxytelluride)","description":"\u003cp\u003eCsV\u003csub\u003e2\u003c\/sub\u003eTe\u003csub\u003e2\u003c\/sub\u003eO is a layered vanadium oxytelluride of the '1221' oxychalcogenide family, crystallizing in the tetragonal P4\/mmm structure with two-dimensional V\u003csub\u003e2\u003c\/sub\u003eO square nets sandwiched between tellurium layers and separated by Cs layers (as grown, the crystals are typically slightly Cs-deficient, Cs\u003csub\u003e1-δ\u003c\/sub\u003eV\u003csub\u003e2\u003c\/sub\u003eTe\u003csub\u003e2\u003c\/sub\u003eO with δ ≈ 0.2). It is the first material in which \u003cstrong\u003ehidden altermagnetism\u003c\/strong\u003e has been experimentally demonstrated: its G-type collinear antiferromagnetic order (Néel temperature near room temperature, ~257–293 K) stacks two-dimensional altermagnetic layers with alternating local spin polarizations, so the bulk bands remain spin-degenerate while each layer carries a d-wave, momentum-dependent spin splitting — verified by neutron diffraction together with spin-resolved ARPES. First-principles calculations find a robust Néel-type antiferromagnetic ground state with orbital-selective spin splitting at the Fermi level, and a secondary transition near 70 K. CsV\u003csub\u003e2\u003c\/sub\u003eTe\u003csub\u003e2\u003c\/sub\u003eO single crystals provide a unique platform for studying \u003cstrong\u003ehidden altermagnetism, layered spin polarization, and altermagnetic spintronics\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrowth method:\u003c\/strong\u003e Self-flux growth. Note: the crystals are moisture-sensitive; storage under inert atmosphere or vacuum is recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e Single crystal, typical size ~1–1.5 mm; purity up to 99.9999% (6N). Multiple high-quality single-crystal pieces are included in each package.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExfoliation difficulty:\u003c\/strong\u003e Moderate — a layered van der Waals crystal that can be mechanically cleaved\/exfoliated, although the ionic interlayer bonding makes isolating ultrathin flakes more demanding than in typical van der Waals materials.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e A small amount of potassium (~5%) may remain in the crystals: potassium is removed by deintercalation during synthesis, and its complete removal cannot always be guaranteed. Like other crystals of this family, the as-grown material is typically slightly Cs-deficient (Cs\u003csub\u003e1-δ\u003c\/sub\u003eV\u003csub\u003e2\u003c\/sub\u003eTe\u003csub\u003e2\u003c\/sub\u003eO, δ ≈ 0.2).\u003c\/p\u003e","brand":"2D Material Supermarket","offers":[{"title":"Default Title","offer_id":54712257151160,"sku":"2MS-CsV2Te2O","price":950.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0649\/0069\/4200\/files\/logo-main-1600_79a5a70a-0c84-4ca9-8b57-6097dfd834c2.png?v=1794313850"}],"url":"https:\/\/2dmaterialsupermarket.com\/collections\/altermagnetic-materials.oembed","provider":"2D Material Supermarket","version":"1.0","type":"link"}